“We wanted to expand on that,” explained Matthew Campbell,a researcher from Emory University's Yerkes National Primate Research Center and lead author of the study.“We're interested in using cartoons for presenting stimuli to animals, because we can control all the features of what we show them,” he continued.nking they were looking at real chimps, he explained that there was evidence that chimpanzees “process animated(动画的) faces the same way they process photographs of faces”.“It's not a real chimpanzee,but it kind of looks like a chimpanzee, and they're responding to that.”including Devyn Carter who designed the cartoons, showed the animals the yawning sequences.
“We also had the cartoons doing other movements with their mouths that the chimps often do,” he said.“The chimps showed a lot more yawning during the yawn video than when the control videos were playing.”According to the passage, the scientists have found that ________.
A.yawning is a contagious facial expression among chimps
B.chimps will imitate a cartoon chimp who is yawning
C.chimps are able to understand cartoons very well
D.chimps like watching cartoons very much
21.According to the passage we can learn that ________.
A.yawning on both cartoon videos and pictures can make chimps yawn
B.Devyn Carter led the study about contagious yawning
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